Peer-to-peer communication in a radio network

• US 7,450,974 B2
• Filed: 10/04/2004
• Issued: 11/11/2008
• Est. Priority Date: 10/01/1997
• Status: Expired due to Fees

• Current Assignee: AT&T Laboratories-Cambridge Limited (AT&T, Inc.)
• Original Assignee: AT&T Laboratories-Cambridge Limited (AT&T, Inc.)
• Inventors: Clarke, David Julian, Osborn, Anthony Paul, Leask, Matthew David, Jones, Alan Henry, Todd, Douglas Terence, Bennett, Frazer David
• Primary Examiner(s): Tran; Tuan A
• Application Number:
  US10/772,666
• Publication Number:
  US 20050032556A1
• Time in Patent Office: 1,499 Days
• Field of Search: 455 411- 2, 455/574, 455/522, 455517-520, 455/445, 455/458, 455/500, 455/502, 4553432- 5, 455507-514, 455/550.1, 455/552.1, 4551271- 5, 370/318, 370/350, 370458-462, 370400-414
• US Class Current: 455/574
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 92/18 between terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile radio network comprises a plurality of communication points, each of which are capable of communicating with any other communication point. Each communication point has a proximity sensor, a transmitter/receiver (14), which is able to send signals to and receive signals from the other communication points. Elements for controlling the transmitter/receiver and elements for storing data to identify the communication points is also described.

Claims

1. A mobile communication point for use in a mobile radio network comprising a plurality of communication points, each capable of communicating with other communication points, the communication point comprising

a transmitter/receiver for sending signals to and receiving signals from the other communication points, the communication point comprising a transmitter/receiver for sending signals to and receiving signals from the other communication points;

and

means to switch the communication point between a high power mode for transmitting or receiving signals and a low power mode defined as a sleep state wherein the communication point is unable to transmit or receive signals, the communication point being controlled to come out of sleep state periodically and broadcast a packet of data containing its unique identity, each communication point of the plurality of communication points broadcasting its unique identify during random timer intervals;

data storage means for storing data identifying the communication point and storing data identifying other communication points which have been interacted with recently, and wherein the communication point determines whether data about a second communication point is stored in its data storage means upon receipt of a transmission from the second communication point, wherein the first communication point is responsive to as request from a second communication point to transmit data about a third communication point from said data storage means to the second communication point.

2. A mobile communication point according to claim 1 in which the communication point waits for a short period after broadcast of its unique identity to detect whether any other communication point is attempting to transmit back to the communication point before returning to the sleep state.

3. A mobile communication point according to claim 2 in which the communication point remains able to transmit or receive signals for a longer period if the communication point receives a response addressed to said communication point during the receive period.

4. A mobile communication point according to claim 1 in which the communication point includes means responsive to an external input to cause the switching means to switch the communication point from low power mode to high power mode.

5. A mobile communication point according to claim 4 in which the means responsive to an external input comprises a low power RF detection circuit responsive to a radio transmission.

6. A mobile communication point according to claim 4 in which the means responsive to an external input comprises an ultrasonic detector.

7. A mobile communication point according to claim 4 in which the means responsive to an external input comprises an infrared detector.

8. A mobile communication point according to claim 4 in which the means responsive to an external input comprises a manual input.

9. A mobile communication point according to claim 1 in which the communication point is responsive to a transmission from a second communication point to send interrogation signals to the second communication point.

10. A mobile communication point according to claim 1 in which the communication point can remain active at all times.